With the rapid proliferation of USB interface in the embedded world, developers are looking for easiest ways to add USB to microcontroller-based applications in their design. ASIX’s new AX781x0 family features four USB connectivity bridge solutions including USB 2.0 to Single Serial (AX78120), USB 2.0 to Dual Serial (AX78120), USB 2.0 to Quad Serial (AX78140) and USB 2.0 to Dual Serial and Single Parallel (AX78140) controllers. Enabling smooth migration from legacy system using ASIX’s MCS78x0 series, AX78120/AX78140 provide pin-to-pin compatible and driver backward compatible with MCS7810/MCS7820/MCS7840.
USB 2.0 to Multi I/O (1S or 2S) Controller
● Single chip USB 2.0 to Multi I/O (1S or 2S) Controller
● USB Device Controller
-- Integrates on-chip USB 2.0 PHY and controller compliant to USB Spec 2.0 and 1.1
-- Supports all USB 2.0 power saving modes (L1, L2)
-- Supports USB High/Full Speed modes with Bus-power or Self-power device auto-detect capability
-- Supports USB LPM (Link Power Management)
● Dual Serial Port Controller
-- Two 16c450/16c550 compatible UARTs
-- Supports SIR IrDA mode on any/all ports
-- Supports RS-232, RS-422 and RS-485 serial ports
-- Supports multi-protocol serial transceivers
-- Supports 5, 6, 7 & 8 bit serial data
-- Supports automatic data direction control
-- Supports multi-drop mode with auto address detection
-- Supports hardware and software flow control
-- Supports baud rates from 50bps to 6Mbps
-- Supports custom baud rates from external clock
-- On-Chip 1024-Byte FIFO for upstream and 512-Byte for downstream data transfer for each Serial Port
-- I2C interface for EEPROM
-- Supports read/write EEPROM through USB interface
-- On-Chip buffers for serial port signals to operate without external transceivers over short cable
-- Pin-to-Pin compatible with MCS7810/MCS7820/MCS7840
-- Driver backward compatible with MCS7810/MCS7820/MCS7840
● Support Remote Wake Up Function
-- Supports Suspend Mode and Remote Wakeup via RXD, RI, DSR, DCD and CTS pin
● Advanced Power Management Features
-- Supports USB LPM (Link Power Management)
-- Supports remote wake up re-trigger
● Integrates on-chip 1.8V and 3.3V voltage regulator and only requires a single 5V power supply
● Single 12MHz clock input from either crystal or oscillator source
● Integrates on-chip power-on reset circuit
● Small form factor with 48-pin LQFP RoHS compliant package
● Operating over 0°C to 70°C or -40°C to +85°C temperature range
Serial Attached Devices
Serial Networking / Monitoring Equipment
Data Acquisition System
POS Terminal & Industrial PC
AX78120 USB 2.0 to 2S Demo Board (AX78120-DMB-2S-1)
This is an AX78120 USB 2.0 to 2S adapter for users to evaluate AX78120 USB 2.0 to 2S functionalities.
Hardware Design Considerations
Is AX78120 IC pin-to-pin compatible to MCS7820 IC?
Yes, AX78120 IC is pin-to-pin compatible to MCS7820 IC.
Where can I obtain the latest AX78120 datasheet, reference schematic and other hardware design archives?
Please register MyASIX membership and then download the latest AX78120 datasheet, reference schematic, PCB layout guide, etc. from AX78120 Product web page directly.
Can ASIX help me to review my own AX78120 schematic and PCB layout?
Yes, please deliver your own AX78120 schematic and PCB layout files to ASIX’s Support (email@example.com) for further review before making your own AX78120 PCB board.
Is the I2C EEPROM required for AX78120 2S applications?
The I2C EEPROM is optional for AX78120 2S applications.
How to program AX78120 I2C EEPROM in-circuit?
The AX78120 supports a Windows EEPROM Utility to program the I2C EEPROM in-circuit.
Does ASIX support RS-232/RS-485 transceivers solutions?
Yes, ASIX also supports different RS-232/RS-485 transceivers solutions. Please visit ASIX UART Transceivers/EL Drivers Products Web page for more details.
Software Design Considerations
Can AX78120 install the original MCS7820 drivers directly?
Yes, you should be able to install the original MCS7820 drivers on AX78120 applications directly. If you have any problems, please download the latest AX781x0 drivers from AX78120 Driver Download web page instead. The latest AX781x0 drivers supports all AX78140/AX78120/MCS7840/MCS7820/MCS7810 applications.
Where can I obtain the latest AX78120 drivers?
Please visit AX78120 Driver Download web page to download proper drivers for your AX78120 target applications.
How to change the COM port number of AX78120?
Yes, we can change the COM port number by using a drop down list located in AX78120 Windows COM Port Properties. To change the COM port number, go to "COM Port Properties => Features => COM Port Number".
Hardware Design Documentation
AX78120 USB 2.0 to 2S Demo Board Reference Schematic
Software & Tools
Linux kernel 5.x/4.x/3.x/2.6.x DriverFor all Android systems, Linux kernel 2.6.14 and later
Windows 11 64-bit DriverFor x64 CPU platform, HLK/WHCK certified
Windows 10 32-bit DriverFor x86 CPU platform, HLK/WHCK certified
Windows 10 64-bit DriverFor x64 CPU platform, HLK/WHCK certified
Windows 8.x 32-bit DriverFor x86 CPU platform, HLK/WHCK certified
Windows 8.x 64-bit DriverFor x64 CPU platform, HLK/WHCK certified
Windows 7/Vista/XP 32-bit DriverFor x86 CPU platform, WHCK certified
Windows 7/Vista/XP 64-bit DriverFor x64 CPU platform, WHCK certified
PCIe/PCI/USB to serial/parallel bridge solutions for industrial computers and embedded systems
UART Transceivers/EL Drivers
5V/3V RS-232/RS-422/RS-485 UART transceivers solutions for industrial computers, embedded systems; EL drivers solutions for PDAs, cell phones and other handheld/portable devices.
PCI Bridge [NOT FOR NEW DESIGN!!]
USB 2.0 to Multi I/O (4S, 2S+1P) Controller